Goodwill and Acquired Intangible Assets - Schedule of Changes in Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Goodwill [Line Items]
Balance, beginning of period	$ 2,353,654	$ 2,191,887
Foreign currency translation adjustments	30,007	(46,903)
Balance, end of period	3,358,511	2,353,654
Intland Software
Goodwill [Line Items]
Goodwill, acquired		240,971
Other Acquisitions
Goodwill [Line Items]
Goodwill, acquired	0	691
Divestiture of Business
Goodwill [Line Items]
Goodwill, Divestiture of business		$ (32,992)
ServiceMax
Goodwill [Line Items]
Goodwill, acquired	$ 974,850